*** YOU NEED TO REGISTER ON THE FORUM BEFORE YOU CAN ACCESS THE DOWNLOAD LINK ***
INSTALLATION INSTRUCTIONS
http://www.xperiablog.net/2015/03/17/guide-to-installing-xperia-lollipop-using-xperifirm-and-flashtool/
- Open link above and skip to the section entitled “FlashTool steps”.
- As you have already downloaded the FTF firmware file, skip to the section where you need to “Flash device”.
XPERIA FIRMWARE DETAILS
This is official stock Sony Xperia firmware.
Model: Sony Xperia ZR (C5503)
Firmware version: 10.5.1.A.0.292_R2D
Region: Nordic (Generic) [1274-1395]
Android version: 4.4.4

Xperia ZR_C5503_10.5.1.A.0.292_Nordic_Generic 4.4.4
Sony Xperia ZR (C5503) Android 4.4.4 firmware - Generic Nordic